If you have $100 to put into crypto and you’re trying to figure out where to start, the honest answer is: most platforms are fine for buying, but only a few are honest about what it’s going to cost you. On a $100 purchase, the fee structure matters more than anything on a marketing landing page.
TLDR
- Coinbase is the best all-around first exchange — $2.99 fee on $100, self-custody path, 200+ coins, real tax reporting.
- Cash App wins for BTC-only beginners — simple, Lightning-enabled, and about 1.75–2% on a $100 buy.
- River has the lowest fees (0.3%) for Bitcoin-only buyers, but it’s less flashy and less well-known.
- Robinhood is fine for zero-commission exposure, but you can’t actually move your coins anywhere.
- Kraken is solid for beginners who want to grow — low Pro mode fees once you’re ready for it.
I’ve been buying crypto since 2014. I’ve used Coinbase, Kraken, Robinhood, and Cash App. I survived 2018, 2020, and 2022. I watched Celsius implode with real money in it. And if someone handed me $100 and asked me where to start in 2026, my answer would depend on one question: do you want to just own some crypto, or do you eventually want to hold it yourself?
That question should drive your choice more than anything else.
Why $100 Changes the Fee Equation
Most exchange fee comparisons are built around $1,000+ purchases. At that scale, the percentage differences matter but aren’t catastrophic. At $100, a 3% fee means you need your investment to go up 3% just to break even. That’s not a disaster, but it’s worth understanding before you click buy.
Here’s what $100 actually costs you on each major platform:
| Platform | Approx. Fee on $100 | Self-Custody? | Coins Available |
|---|---|---|---|
| Coinbase (Simple) | ~$2.99 (~3%) | Yes | 200+ |
| Cash App | ~$1.75–2.00 (~1.75–2%) | Yes (BTC only) | Bitcoin only |
| River | ~$0.30 (~0.3%) | Yes (BTC only) | Bitcoin only |
| Robinhood | ~$0.50–1.00 (spread, invisible) | No | ~20 coins |
| Kraken (Simple Buy) | ~$1.00–1.50 + spread | Yes | 350+ |
A few things to flag on that table:
Robinhood’s “no fee” claim is real but incomplete. They make money on spread — the difference between what you pay and the market price. It’s roughly 0.5–1% depending on the asset and market conditions. You don’t see it as a line item, but it’s there.
Cash App requires full identity verification, including your SSN, before you can buy Bitcoin. The idea that Cash App has a no-KYC threshold is outdated — they require ID verification for Bitcoin. Don’t start there expecting to skip that step.
Coinbase’s $2.99 flat fee applies to the $50–$200 range, which covers most $100 buys. That’s about 3% effective. It stings but it’s transparent, and Coinbase has earned enough trust over the years that the premium isn’t irrational.
Best Crypto Exchange for Beginners With $100: My Picks
Coinbase — Best All-Around First Exchange
Coinbase is where most people I know started, and there’s a reason. The app is clean, the onboarding takes about 10 minutes, and you can buy fractional amounts of hundreds of coins starting from $2. On a $100 purchase, you’re paying $2.99 flat. That’s your honest starting price.
What I care about more than the upfront fee is the self-custody path. Once you have crypto on Coinbase, you can withdraw it to an external wallet — Ledger, Trezor, Coldcard, whatever you eventually decide to use. That matters. I learned the hard way with Celsius that leaving everything on a platform forever is a choice you might regret.
Coinbase also gives you real tax reporting. When you sell, you’ll get the 1099 forms and you can export transaction history. At $100, this might feel like overkill, but when your $100 turns into $500 and you want to sell some, you’ll be glad the paperwork is handled.
What Coinbase doesn’t do well at the $100 level: the 3% effective fee is the highest of any major platform besides Gemini’s simple interface. And Coinbase One ($29.99/month for zero trading fees) doesn’t pencil out until you’re buying or selling a couple thousand dollars a month.
Bottom line: Start here if you’re not sure what you want yet. The fees are honest, the path to self-custody is clear, and the ecosystem doesn’t trap you.
Cash App — Best for Bitcoin-Only Beginners
If you know you only want Bitcoin and you want the simplest possible experience, Cash App is hard to beat. You open the app — which you probably already have — tap the Bitcoin tab, and buy. That’s genuinely it.
Fees on Cash App: approximately 1.75% per purchase, which beats Coinbase Simple at the $100 level. On $100, you’re paying roughly $1.75–2.00 depending on the day and market conditions. That’s meaningfully cheaper than Coinbase’s $2.99 flat fee.
Lightning Network support is a real differentiator. Cash App lets you send and receive Bitcoin via the Lightning Network, which means near-instant, low-cost transfers. Most exchanges don’t offer this. If you ever want to experiment with paying someone in Bitcoin, Cash App is set up for it better than Coinbase or Kraken.
Self-custody: Cash App lets you withdraw Bitcoin to an external wallet for free on standard-speed withdrawals of 0.001 BTC or more. For $100, if BTC is at $85,000, that’s about 0.00118 BTC — just barely over the free threshold. So you can actually move your Bitcoin off Cash App once you decide you want a hardware wallet.
The real limitation: Cash App is Bitcoin only. No ETH, no SOL, no altcoins. And it’s not built for people who want to track a portfolio, stake assets, or generate tax documents beyond basic transaction history. If you start here and later want to buy anything other than Bitcoin, you’ll be opening another account somewhere else.
For a true beginner who wants one asset and simplicity, Cash App is a solid choice.
River — Best Fees for Bitcoin-Only Buyers (If You’re Fee-Conscious)
River doesn’t have the marketing budget of Coinbase or the brand recognition of Cash App, but it has the lowest fees of any legitimate Bitcoin-only platform: approximately 0.3% per trade. On a $100 purchase, you’re paying about $0.30.
That’s not a typo. River is run by Bitcoiners, regulated, and has a strong track record. They also give you one free Bitcoin withdrawal per month, which matters when you want to move your coins to cold storage.
Why isn’t everyone using River? Partly because the app is more austere — it’s designed for people who already know they want Bitcoin and don’t need a flashy interface. If you’re a true beginner still figuring out the basics, the extra hand-holding on Coinbase or Cash App might be worth the extra 2-3% on your first few purchases.
But if you’re reading this knowing you want BTC and you care about fees, River is legitimately underrated.
Robinhood — Fine for Passive Exposure, Not for Actual Bitcoin
If you already have a Robinhood account for stocks and you want to add a tiny bit of crypto exposure without opening another account, Robinhood works. You can buy as little as $1 of Bitcoin, Ethereum, or about 20 other coins with zero commission.
The catch: you cannot move your crypto off Robinhood in any meaningful way. Robinhood has a “wallet” feature but it’s limited in scope. If you put your $100 into Bitcoin on Robinhood and later decide you want to move it to a Ledger hardware wallet, you’ll need to sell it, pay taxes on any gains, and re-buy elsewhere. That’s an unnecessary friction point.
Use Robinhood for stocks. Use something else for crypto you intend to actually hold and control.
Kraken — Best for Beginners Who Want to Level Up
Kraken sits in an interesting spot. The simple buy interface charges about 1% + spread, which is competitive. The minimum simple buy is $10, so $100 is comfortably above that. And if you ever want to move to Kraken Pro and place limit orders, the fees drop to 0.25% maker / 0.40% taker — significantly better than Coinbase Advanced Trade’s entry tier.
The downside for true beginners: Kraken’s app is functional but not as polished as Coinbase. The onboarding feels slightly more technical. You won’t be confused, but you won’t be hand-held either.
If you’re a beginner who thinks they might want to graduate to placing limit orders and buying dips systematically within six months, Kraken is worth starting on. The fee structure rewards you as you get more active.
What Actually Matters at $100
Here’s the honest truth about your first $100 in crypto:
The fee is almost irrelevant to your long-term outcome. Whether you pay $0.30 or $2.99 to buy your first Bitcoin will not determine whether this was a good decision in 10 years. What matters is that you start on a platform you’ll actually use, that you understand what you own, and that you have a path to take self-custody if you want it.
The self-custody question is real. I’m not saying you need a hardware wallet on day one. You don’t. But you should start on a platform that gives you the option to move your coins later. That rules out Robinhood as a serious crypto account.
Start simple. If you’re overwhelmed, just open a Coinbase account, buy $100 of Bitcoin, and figure out the rest later. The platform fee won’t make or break you. Getting started will.
What I’d Tell a Friend With $100 Today
If they know nothing about crypto: Coinbase. Straightforward, safe enough, good tax reporting.
If they know they want Bitcoin and only Bitcoin: Cash App for simplicity, River if they care about minimizing fees.
If they’re slightly more curious and want to learn: Kraken, because the Pro mode upgrade is worth it once they’re ready.
Skip Robinhood for crypto. It’s fine for stocks. For crypto, you want the ability to actually own what you buy.
What to Do After Your First Buy
You bought your first Bitcoin or ETH. Here’s what happens next — and what most beginners skip.
Enable two-factor authentication immediately. If your exchange account only has a password protecting it, you’re exposed. Every major exchange supports 2FA via an authenticator app (Google Authenticator, Authy). This takes five minutes and prevents the most common account-level attacks. Use an authenticator app, not SMS — SIM-swap attacks are real.
Understand where your crypto actually lives. When you buy on Coinbase or Kraken, your crypto sits in a custodial wallet. The exchange controls the keys. This is fine for now, but it means you’re trusting the platform the same way you trust a bank. The difference is that crypto deposits aren’t FDIC-insured. If Coinbase had a Celsius-level collapse — which I don’t expect, but I also didn’t expect Celsius — your coins could be tied up in bankruptcy proceedings.
Think about the self-custody question, even if you don’t act yet. You don’t need a hardware wallet for $100. A Ledger or Trezor costs $80–$150 and only makes financial sense once you’re holding a meaningful amount. But you should know that the path exists and plan for it once your position grows. When you buy on Coinbase, Cash App, or Kraken, you can move your coins to a personal wallet later. On Robinhood, you can’t — not meaningfully.
Don’t check the price every hour. This sounds obvious and it isn’t. Bitcoin is volatile. A 5–10% swing in a week is completely normal. A 20–30% drawdown in a bear cycle is normal. If you bought $100 and it’s suddenly worth $75, the question is whether anything fundamental changed — and for Bitcoin, a 25% dip doesn’t change the long-term thesis. Obsessive price-checking turns routine volatility into emotional decisions. Set a check-in cadence and stick to it: once a week is more than enough.
Common Beginner Mistakes With $100
These are the ones I see repeatedly, and most of them cost real money.
Using the simple buy interface when a better option exists. On Coinbase, the default “Buy” screen charges a flat $2.99 on a $100 purchase — that’s 3%. Coinbase Advanced Trade is right there in the same app, and it charges roughly 0.6% on the same buy using a limit order. That’s a $2.40 difference on $100. Sounds small. Multiply it by every purchase you make over the next few years and it compounds into real money. Learn the Advanced Trade interface early.
Using market orders instead of limit orders. A market order buys at whatever the current ask price is — right now, immediately. A limit order lets you set the price you’re willing to pay and wait. For patient buyers who aren’t trying to time short-term moves, limit orders almost always result in a better fill. They also qualify for the maker rate on most exchanges, which is lower than the taker rate. There’s no good reason to use market orders for a planned crypto purchase.
Not saving your seed phrase if you move to self-custody. If you eventually move your crypto off an exchange and onto a hardware wallet, you’ll be given a 12 or 24-word seed phrase. This is the only backup. If your hardware wallet is lost, stolen, or fails, the seed phrase is how you recover your funds. Write it down on paper. Store it somewhere fire-resistant. Do not store it in a photo on your phone, in a notes app, or in your email. Losing a seed phrase means losing the crypto permanently — there’s no customer support to call.
Panic selling on the first major dip. I’ve been through four significant crypto bear markets. The instinct when prices fall 30% is to cut losses. And sometimes that’s rational. But if you bought Bitcoin with a 5-year horizon and it drops 30%, the only question that matters is whether the long-term thesis changed — not whether you’re temporarily down. Most beginners who sell in a panic sell near the bottom and miss the recovery. If a 30% drawdown on $100 would cause you to sell, you probably need to understand your own risk tolerance better before increasing the position.
FAQ
What is the minimum amount to buy crypto on Coinbase?
About $2 for most assets. Coinbase supports fractional purchases, so $100 buys you a fraction of Bitcoin, Ethereum, or dozens of other coins.
Does Cash App require ID to buy Bitcoin?
Yes. Cash App requires full identity verification — including your SSN — before you can buy or sell Bitcoin. There is no tier below which you can skip this.
Which exchange is best for moving Bitcoin to a hardware wallet later?
Coinbase, Cash App, Kraken, and River all allow withdrawals to external wallets. Robinhood does not offer a real off-ramp to personal custody.
Is it worth using Coinbase One at the $100 level?
No. Coinbase One costs $29.99/month for zero-fee trades. You’d need to buy and sell several thousand dollars per month to break even on that subscription.
What about Gemini?
Gemini is a legit exchange but their simple buy fees (1.49% + 0.5% convenience fee) make them the most expensive major option at the $100 level. Their ActiveTrader interface cuts fees dramatically, but that’s not a beginner tool.
Disclosure: Some links in this article are affiliate links. If you open a Coinbase or Kraken account through my link, I may earn a small commission at no cost to you. I only recommend platforms I’ve actually used.
